The three main theories used in international political economy are constructivism, realism and liberalism. Researchers commonly use these theories to explain economic events in the international political economy. Liberals care about the interest of the individual while constructivists are very concerned with how international relations are constructed by the ideas of the system. This article uses realism theory to explain the relationships between state and non-state actors in the international system. Realism is based on the idea that the international system exists according to the Hobbesian, anarchic and brutal state of nature. There is no authority above the states in the system (Marten 09/12/2011). Influential states have powers that they use to subjugate the poor and powerless within the system. In order to understand the theory in detail, the article evaluates three supranational regimes and their function in the international system. States agree to form governments that control internal affairs. It is not surprising that any sovereign state has the power to enforce and prescribe laws. These powers are limited in the international system because there is no Leviathan that controls the activities of all members. The first argument is that the United States and other great powers use supranational organizations to promote their interests (Wolf 87). The WTO is a global body responsible for overseeing how countries conduct trade globally. Liberals argue that the body benefits all states that subscribe to it because they benefit from free markets and business opportunities. For liberals, the world organization in charge of trade is supposed to arbitrate conflicts arising from commercial exchanges. N...... middle of paper...... is in danger. Tourists have been kidnapped on several occasions, which has had serious consequences on the tourism industry. It should not be forgotten that Kenya generates more than 20% of total tourism revenue. Al Shabaab militiamen therefore constitute a threat to Kenyan interests. Works Cited Gholz, Eugene and Daryl, Press. "Protecting the 'Prize': Oil and the U.S. National Interest". Security Studies, 19.3, 2010, 453-485. Milner, Helen. "Globalization, development and international institutions: normative and positive perspectives". Review essay, 3.4, 2005, 833-854. Rosato, Sebastian. “Europe's troubles: power politics and the state of the European project”. International Security, 35.4, 2011, 45-86. Stone, Randall. "How to reform the IMF". Current History, 109.730, 2010, 342-348. Wolf, Martin. Why globalization works. 1st ed. Sydney: Yale University Press, 2004.6